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A place to hang out and chat about astronomy

The Space Elevator and Sun's gravity

I was wondering if the space elevator ever was constructed would it be able lift very heavy objects off the earth.

As far as I know there comes a point far away from the earth where the earth's gravity is too weak to hold onto objects and the sun's gravity kicks in and begins to pull the object towards itself. If the space elevator cable was super long, could it be extended so far that ...
Read more : The Space Elevator and Sun's gravity | Views : 2034 | Replies : 5

Mars images from Spirit, Opportunity and Curiosity

I am reaching out as part of a citizen science project sponsored by ESA called LabelMars.

Thousands of images of Mars taken by Spirit, Opportunity and Curiosity Rovers have been made available to the project.

We're looking for help from the community to label geological features within the images taken from these past missions. This will be used to form the basis future robotic exploration missions to Mars and also enable large-scale analysis of the ...
Read more : Mars images from Spirit, Opportunity and Curiosity | Views : 1587 | Replies : 3

Expanding Universe

Astrophysicists have indicated that the universe is expanding faster (stretching) and that the further Galaxies are away from our own Galaxy the faster they appear to be moving away. I have also assumed that when we look at Galaxies further away we are in effect looking back in time. So when we look at those distant Galaxies, are we not seeing their speed as it was in the past not as it is now?
Read more : Expanding Universe | Views : 1723 | Replies : 4

(Depth of Field)

As a professional sports photographer (I shoot for Classic Cars Magazine) and freelance journalist I know the importance of DOF (Depth of Field)

What I found the other day was the apparent shallow DOF of my two scopes.

Is there a way to calculate the DOF of a scope for terrestrial shooting and I presume that DOF also makes a difference when imaging the Moon for example.

Read more : (Depth of Field) | Views : 1248 | Replies : 1

Orion skyscanner

I am new to this and looking for advice .
I have an Orion skyscanner 100mm , f4 , I would like to take pictures of the moon and other planets ... It came with 10 and 20 mm eyepiece .. they are not the best ..Any suggestions on which eyepiece go best with this scope , I'm also looking to buy barlows but have read conflicting reports on what ones are useful for ...
Read more : Orion skyscanner | Views : 1970 | Replies : 3

Heated Jacket

Relatives concerned about me being out in freezing temperatures for hours on end have bought me a heated jacket. I haven't had a chance to try it out in earnest yet, but when I do I'll report my experience here. It takes the form of an armless jacket which can be worn under a normal coat. A 7.2v rechargeable battery in a pocket heats 5 heating pads with 3 levels of heat.
Read more : Heated Jacket | Views : 1488 | Replies : 2

I can't wait till February

That is when the skkywatcher Esprit 100mm is next available, I know that because I know the man at OVL UK, so i have just ordered this which will come next week, as this is a massive purchase I do hope I am doing the right thing

https://www.widescreen-centre.co.uk/ast ... ractor/sky
Read more : I can't wait till February | Views : 1415 | Replies : 2

A few more things came today before Christmas

A few more things came today before Christmas, and the telerad is larger than I expected, remember NOT all red dot finders are telerads, telerad is a specific make.

William Optics binoviewer with 20mm and additional 10mm eyepieces

when uploading images I now get this, why

Sorry, the board attachment quota has been reached.
Read more : A few more things came today before Christmas | Views : 1938 | Replies : 5

Just bought this for my Celestron HD

Just bought this for my Celestron HD, arriving Monday

http://www.rothervalleyoptics.co.uk/jmi ... ution.html
Read more : Just bought this for my Celestron HD | Views : 1444 | Replies : 3


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